The thousands of volunteer readers who bring over 100 new books a month originally in Project Gutenberg, and other public domain sources (including, of course, the Internet Archive) to the listening public.

With over 7,000 audio books, LibriVox is one of the largest publishers of audiobooks in the world, and certainly the largest publisher of free public domain audiobooks.

And the relentless good cheer of Hugh McGuire who over the last eight years has created this fabulous service, and continued to make contributions to open (e)book publishing with PressBooks.com. @hughmcguire